﻿using System;
using System.Collections.Generic;
using System.Text;
using System.Collections.Specialized;
using System.Text.RegularExpressions;

namespace PingRecorder
{
    /// <summary>
    /// Arguments class
    /// </summary>
    public class Arguments{
        // Variables
        private StringDictionary Parameters;

        // Constructor
        public Arguments(string[] Args)
        {
            Parameters = new StringDictionary();
            Regex Spliter = new Regex(@"^-{1,2}|^/|=",
                RegexOptions.IgnoreCase|RegexOptions.Compiled);

            Regex Remover = new Regex(@"^['""]?(.*?)['""]?$",
                RegexOptions.IgnoreCase|RegexOptions.Compiled);

            string Parameter = null;
            string[] Parts;

            // Valid parameters forms:
            // {-,/,--}param{ ,=,:}((",')value(",'))
            // Examples: 
            // -param1 value1 --param2 /param3:"Test-:-work" 
            //   /param4=happy -param5 '--=nice=--'
            foreach(string Txt in Args)
            {
                // Look for new parameters (-,/ or --) and a
                // possible enclosed value (=,:)
                Parts = Spliter.Split(Txt,3);

                switch(Parts.Length){
                // Found a value (for the last parameter 
                // found (space separator))
                case 1:
                    if(Parameter != null)
                    {
                        if(!Parameters.ContainsKey(Parameter)) 
                        {
                            Parts[0] = 
                                Remover.Replace(Parts[0], "$1");

                            Parameters.Add(Parameter, Parts[0]);
                        }
                        Parameter=null;
                    }
                    // else Error: no parameter waiting for a value (skipped)
                    break;

                // Found just a parameter
                case 2:
                    // The last parameter is still waiting. 
                    // With no value, set it to true.
                    if(Parameter!=null)
                    {
                        if(!Parameters.ContainsKey(Parameter)) 
                            Parameters.Add(Parameter, "true");
                    }
                    Parameter=Parts[1];
                    break;

                // Parameter with enclosed value
                case 3:
                    // The last parameter is still waiting. 
                    // With no value, set it to true.
                    if(Parameter != null)
                    {
                        if(!Parameters.ContainsKey(Parameter)) 
                            Parameters.Add(Parameter, "true");
                    }

                    Parameter = Parts[1];

                    // Remove possible enclosing characters (",')
                    if(!Parameters.ContainsKey(Parameter))
                    {
                        Parts[2] = Remover.Replace(Parts[2], "$1");
                        Parameters.Add(Parameter, Parts[2]);
                    }

                    Parameter=null;
                    break;
                }
            }
            // In case a parameter is still waiting
            if(Parameter != null)
            {
                if(!Parameters.ContainsKey(Parameter)) 
                    Parameters.Add(Parameter, "true");
            }
        }

        // Retrieve a parameter value if it exists 
        // (overriding C# indexer property)
        public string this [string Param]
        {
            get
            {
                return(Parameters[Param]);
            }
        }
    }
}
